I have written letters to both the BPDA and Cambridge planning departments at different times, in support of different projects. I don't have a huge outlet as I'm not technically a resident, and some people think I shouldn't get to have any voice whatsoever. So part of what I rely on is relaying my ideas to people who do have that larger voice. Besides here, surrounded by mostly like-minded individuals, where else am I supposed to find those people?
I don't know what kind of voice you might have within the city. However, the reason I "repeat things over and over" is because I see you and others essentially focusing on "how do I get that $5 bill out of that tree?" (175 Congress) when there's a $100 bill lying on the ground right in front of you (garage about to be redeveloped). Why focus so much on the small stuff, when there is large stuff within a stone's throw of the parcel that is still undecided but about to be permanently botched?
I think the biggest problem is that too many people who "have the voice" don't want to see new housing built. They are perfectly comfortable watching their own property values rise and preventing their neighborhoods from getting any busier (ie meeting the existing demand). It's a similar dichotomy to what I complain about in my job. The incentives to help further my own career don't necessarily align with what's best for the company. For Boston residents, they have incentives against more residential development in order to preserve/improve the net worth of their real estate. Obviously renters get crushed, and outsiders can't find a place to live, and in fact it contributes to higher rents across the entire metro (ie my own personal stake in the matter). So most of us are worse off if they botch these parcels, don't build enough housing to offset the insane amount of labs, etc, but those who have the largest voices (Boston property owners) are motivated to make sure this is exactly what happens. Their incentives do not align with improving the city in the ways that it needs to be improved.
When those people are catered to, we dig a deeper hole for ourselves as the housing crisis affects everyone, not just the Boston residents. We're creating all these high-paying new jobs across the metro, but where are all these people supposed to live? I'd rather see them flocking towards a bunch of new tall TOD residentials that I can't afford myself, than competing directly with me in the more modest dwellings. I can't outbid a rich person, so what I need is for them to have enough places to choose from that they don't feel the need to bid against me at all. When we take spots that are prime for a 600' residential (how many units would that be, like 500+?) and instead make them squat labs (bringing in more wealthy people who need places to live) then we are making decisions that will lead to Boston becoming the most unaffordable metro in the country. I may not have a loud voice in Boston proper, but I absolutely have a stake when the decisions there affect me a couple towns over.